From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Tue Dec 21 1999 - 11:25:29 PST
>There is another point over here, which was sort of discussed here
>on the list which is , WHAT IS DIFFERENTIAL SIGNALLING?
>CML/pCML have "both" the currents (diff. magnitude) sinking "into" the
>ECL/pECL have "both" the currents (diff. magnitude) sourceing "out of"
>LVDS fits into my concept of diffreential that the same magnitude current
>flows in both the wires/tracks but in opposite direction.One sourcing
>and other sinking.
The main difference is the DC common-mode current. If you removed the DC
component, the switching currents in CML/ECL become fully complementary or
On the other hand, the drivers are asymmetrical, so rise/falltimes might not
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